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/*
* Copyright (C) 2007-2013 Rich Waters <raw@goodhumans.net>
*
* This file is part of lib_mysqludf_preg.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/** @file ghmysql.c
*
* @brief Provides some functions that are shared by the various
* gh udf functions.
*
*/
#include "ghmysql.h"
#include "ghfcns.h"
#include <time.h>
#include <stdarg.h>
/**
* @fn char *ghargdup( UDF_ARGS *args,int i )
*
* @brief extract argument as a newly allocated null-terminated memory area
*
* @param args - args from the UDF function call
* @param i - offset of argument to extract.
*
* @return pointer - to newly allocate memory if successful
* @return NULL - if arg is NULL or not enough memory
*
*/
char *ghargdup( UDF_ARGS *args,int i )
{
int l ;
char *s ;
char *colval = NULL ;
if( (l=args->lengths[i] ) && (s=args->args[i]) )
{
colval = ghstrndup( s , l ) ;
}
return colval ;
}
/**
* @fn char *ghargdups( UDF_ARGS *args,int i , unsigned long *l)
*
* @brief extract argument as a newly allocated null-terminated memory area,
* and set the length to the size of that area
*
* @param args - args from the UDF function call
* @param i - offset of argument to extract.
* @param l - store the length of the argument here
*
* @return pointer - to newly allocate memory if successful
*
* @details This is useful for guaranteeing not to have NULL as an argument
*/
char *ghargdups( UDF_ARGS *args , int i , unsigned long *l)
{
if( !(*l=args->lengths[ i ]))
{
return strdup( "" ) ;
}
else if( !args->args[i]) {
*l = 0 ;
return strdup( "" ) ;
}
else {
return ghargdup( args , i ) ;
}
}
/**
* @fn char *ghargIsNull( UDF_ARGS *args,int argNum)
*
* @brief is the given argument NULL
*
* @param args - args from the UDF function call
* @param i - the argument to test
*
* @return int - 1 if the argument is NULL, 0 otherwise
*
* @details - this only returns true if the arg is specified as NULL
* when in the mysql statement. This does not return true if the
* NULL results from evaluating a column. The purpose of this function
* in so that init functions can differentiate NULL constants from
* NULL meaning that there are no constant arguments. This is important
* because there is better error handling in the API for init functions
* than mains.
*/
int ghargIsNullConstant(UDF_ARGS *args, int argNum)
{
if( args->arg_count > argNum && !args->args[argNum] &&
!strncmp( args->attributes[argNum], "NULL" , 4 ) ) {
return 1 ;
}
return 0 ;
}
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